backbuild should be best effort

.github/workflows/backbuild.yml

@@ -63,6 +63,7 @@ jobs:
     name: publish
     runs-on: ubuntu-latest
     needs: build
+    if: "${{ always() && !cancelled() }}"
     steps:
     - name: checkout repository
       uses: actions/checkout@0ad4b8fadaa221de15dcec353f45205ec38ea70b # v4